
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>websocket通讯</title>
</head>
<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.js"></script>
<script>
    var socket;
    function openSocket() {
        if(typeof(WebSocket) == "undefined") {
            setMessageInnerHTML("您的浏览器不支持WebSocket");
        }else{
            setMessageInnerHTML("您的浏览器支持WebSocket");
            //实现化WebSocket对象，指定要连接的服务器地址与端口  建立连接
            var socketUrl="http://localhost:9000/ws/"+$("#userId").val();
            socketUrl=socketUrl.replace("https","ws").replace("http","ws");
            console.log(socketUrl);
            if(socket!=null){
                socket.close();
                socket=null;
            }
            socket = new WebSocket(socketUrl);
            //打开事件
            socket.onopen = function() {
                setMessageInnerHTML("会话打开");
                //socket.send("这是来自客户端的消息" + location.href + new Date());
            };
            //获得消息事件
            socket.onmessage = function(msg) {
                setMessageInnerHTML(msg.data);
                //发现消息进入    开始处理前端触发逻辑
            };
            //关闭事件
            socket.onclose = function() {
                setMessageInnerHTML("会话已关闭");
            };
            //发生了错误事件
            socket.onerror = function() {
                setMessageInnerHTML("websocket发生了错误");
            }
        }
    }

    //将消息显示在网页上
    function setMessageInnerHTML(innerHTML){
        document.getElementById('message').innerHTML += innerHTML + '<br/>';
    }


    function sendMessage() {
        if(typeof(WebSocket) == "undefined") {
            setMessageInnerHTML("您的浏览器不支持WebSocket");
        }else {
            setMessageInnerHTML("您的浏览器支持WebSocket");
            setMessageInnerHTML('{"toUserId":"'+$("#toUserId").val()+'","contentText":"'+$("#contentText").val()+'"}');
            socket.send('{"toUserId":"'+$("#toUserId").val()+'","contentText":"'+$("#contentText").val()+'"}');
        }
    }
</script>
<body>
<p>【userId】：<div><input id="userId" name="userId" type="text" value="10"></div>
<p>【toUserId】：<div><input id="toUserId" name="toUserId" type="text" value="20"></div>
<p>【toUserId】：<div><input id="contentText" name="contentText" type="text" value="hello websocket"></div>
<p>【操作】：<div><a  onclick="openSocket()" >开启socket</a></div>
<p>【操作】：<div><a onclick="sendMessage()">发送消息</a></div>
<p>消息：</p><div id="message"></div></p>
</body>

</html>

